Close connections gracefully
Close connections gracefully

On shutting down, close all streams and send a GoAway frame to the endpoint.

fredthomsen/hyper,masaori335/hyper,irvind/hyper,Lukasa/hyper,lawnmowerlatte/hyper,Lukasa/hyper,fredthomsen/hyper,jdecuyper/hyper,lawnmowerlatte/hyper,jdecuyper/hyper,plucury/hyper,irvind/hyper,plucury/hyper,masaori335/hyper